My throat is REALLY dry and sore from coughing. Cough drops and even drinking water isn't helping. Help!!!?

I'm on an antibiotic cos I have bronchitis and a sinus infection but my throat is KILLING me!!!! I even took medicine for sore throats: Chloreseptic and Theraflu Severe Cold. That isn't helping that much and it's hard for me to sleep because it burns when I breathe because my throat is soooo dry. I'm not coughing much anymore but my throat is still very sore and dry from earlier. I'd really appreciate some advice!!!